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  • 1
    Monographie ausleihbar
    Monographie ausleihbar
    San Diego [u.a.] : Acad. Press
    Signatur: G 8986 ; AWI G6-94-0232
    Materialart: Monographie ausleihbar
    Seiten: XII, 345 S. : graph. Darst.
    ISBN: 0127545603
    Serie: Academic Press geology series
    Standort: Kompaktmagazin oben
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Zweigbibliothek: AWI Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Supplement to: Jenkins, Janice A; Williams, Douglas F (1984): Nile water as a cause of eastern Mediterranean sapropel formation: evidence for and against. Marine Micropaleontology, 8(6), 521-534, https://doi.org/10.1016/0377-8398(84)90011-2
    Publikationsdatum: 2023-05-12
    Beschreibung: During the late Pleistocene, sapropels (layers of organic-carbon rich sediment) formed throughout the entire Eastern Mediterranean Basin in close association with glacial/interglacial transitions. The current theory for the mechanism of sapropel formation involves a density stratification of the water column, due to the invasion of a large quantity of low-saline water, which resulted in oxygen depletion of the bottom waters. Most workers believe that this low-salinity water was glacial meltwater that entered the Mediterranean via the Black Sea and a series of interconnected glacial lakes, but the suggestion also has been made that the freshwater originated from the Nile River. In this study the oxygen isotope values of planktonic foraminifera,Globigerinoides ruber, have been examined in six gravity cores and one piston core from the southern Levantine Basin, and compared with the oxygen isotope records ofG. ruber from other areas of the Eastern Mediterranean. This study deals mainly with the latest sapropel which was deposited approximately 7000 to 9000 years ago. Results indicate that Nile discharge probably does reduce salinities somewhat in the immediate area surrounding the mouth of the Nile, but this water is rapidly mixed with the highly saline waters of the easternmost Mediterranean. Using a mixing equation and surface water salinity limitations, an approximate oxygen isotope balance of surface waters was calculated for the time of latest sapropel deposition. This calculation shows that neither Nile River discharge nor Black Sea input (nor both together) are large enough to account for the large-scale oxygen isotope depletion associated with latest sapropel deposition in the Eastern Mediterranean. This suggests that part of the isotopic change at Termination I is probably due to increased surface water salinities during the last glacial maximum. In addition, evidence from the timing of sapropel 1 deposition and the dissolved oxygen balance indicates that deposition of the latest sapropel is associated with increased surface water production of biogenic material, as much as three times higher than that of present day.
    Schlagwort(e): CH119-12PG; CH119-16PG; CH119-18PC; CH119-18PG; CH119-6PG; CHA_UK; Challenger; Climatic Variability of the Mediterranean Paleo-circulation; CLIVAMP; GC; Gravity corer; Mediterranean Sea, Eastern Basin; P6508-36B; PC; Piston corer
    Materialart: Dataset
    Format: application/zip, 6 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2023-05-12
    Schlagwort(e): CH119-6PG; CHA_UK; Challenger; Climatic Variability of the Mediterranean Paleo-circulation; CLIVAMP; DEPTH, sediment/rock; GC; Globigerinoides ruber white, δ18O; Gravity corer; Isotope ratio mass spectrometry; Mediterranean Sea, Eastern Basin
    Materialart: Dataset
    Format: text/tab-separated-values, 9 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2023-05-12
    Schlagwort(e): CH119-16PG; CHA_UK; Challenger; Climatic Variability of the Mediterranean Paleo-circulation; CLIVAMP; DEPTH, sediment/rock; GC; Globigerinoides ruber white, δ13C; Globigerinoides ruber white, δ18O; Gravity corer; Isotope ratio mass spectrometry; Mediterranean Sea, Eastern Basin
    Materialart: Dataset
    Format: text/tab-separated-values, 18 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2023-05-12
    Schlagwort(e): CH119-12PG; CHA_UK; Challenger; Climatic Variability of the Mediterranean Paleo-circulation; CLIVAMP; DEPTH, sediment/rock; GC; Globigerinoides ruber white, δ18O; Gravity corer; Isotope ratio mass spectrometry; Mediterranean Sea, Eastern Basin
    Materialart: Dataset
    Format: text/tab-separated-values, 8 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2023-05-12
    Schlagwort(e): CH119-18PG; CHA_UK; Challenger; Climatic Variability of the Mediterranean Paleo-circulation; CLIVAMP; DEPTH, sediment/rock; GC; Globigerinoides ruber white, δ13C; Globigerinoides ruber white, δ18O; Gravity corer; Isotope ratio mass spectrometry; Mediterranean Sea, Eastern Basin
    Materialart: Dataset
    Format: text/tab-separated-values, 20 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2023-05-12
    Schlagwort(e): Climatic Variability of the Mediterranean Paleo-circulation; CLIVAMP; DEPTH, sediment/rock; GC; Globigerinoides ruber white, δ18O; Gravity corer; Isotope ratio mass spectrometry; P6508-36B
    Materialart: Dataset
    Format: text/tab-separated-values, 16 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Publikationsdatum: 2023-05-12
    Schlagwort(e): CH119-18PC; CHA_UK; Challenger; Climatic Variability of the Mediterranean Paleo-circulation; CLIVAMP; DEPTH, sediment/rock; Globigerinoides ruber white, δ13C; Globigerinoides ruber white, δ18O; Isotope ratio mass spectrometry; Mediterranean Sea, Eastern Basin; PC; Piston corer
    Materialart: Dataset
    Format: text/tab-separated-values, 14 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Supplement to: Zachos, James C; Arthur, Michael A; Thunell, Robert C; Williams, Douglas F; Tappa, Eric (1985): Stable isotope and trace element geochemistry of carbonate sediments across the Cretaceous/Tertiary boundary at Deep Sea Drilling Project Hole 577, Leg 86. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 513-532, https://doi.org/10.2973/dsdp.proc.86.120.1985
    Publikationsdatum: 2023-05-12
    Beschreibung: Detailed analyses of well-preserved carbonate samples from across the Cretaceous/Tertiary boundary in Hole 577 have revealed a significant decline in the d13C values of calcareous nannoplankton from the Maestrichtian to the Danian Age accompanied by a substantial reduction in carbonate accumulation rates. Benthic foraminifers, however, do not exhibit a shift in carbon composition similar to that recorded by the calcareous nannoplankton, but actually increase slightly over the same time interval. These results are similar to the earlier findings at two North Pacific Deep Sea Drilling Project locations, Sites 47.2 and 465, and are considered to represent a dramatic decrease in oceanic phytoplankton production associated with the catastrophic Cretaceous/Tertiary boundary extinctions. In addition, the change in carbon composition of calcareous nannoplankton across the Cretaceous/Tertiary boundary at Hole 577 is accompanied by only minor changes in the oxygen isotope trends of both calcareous nannoplankton and benthic foraminifers, suggesting that temperature variations in the North Pacific from the late Maestrichtian to the early Danian Age were insignificant.
    Schlagwort(e): Deep Sea Drilling Project; DSDP
    Materialart: Dataset
    Format: application/zip, 4 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Supplement to: Williams, Douglas F; Kohl, Barry (1986): Isotope chronostratigraphy and carbonate record for Quaternary site 619, Pigmy Basin, Louisiana Continental Slope. In: Bouma, AH; Coleman, JM; Meyer, AW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 96, 577-585, https://doi.org/10.2973/dsdp.proc.96.137.1986
    Publikationsdatum: 2023-06-27
    Beschreibung: A detailed oxygen-isotope record and planktonic foraminiferal biostratigraphy are used to construct a chronostratigraphic framework for Site 619, Pigmy Basin, on the Louisiana continental slope. Within this framework, sediments accumulated in Pigmy Basin at a fairly constant rate over the last 105,000 yr. The oxygen-isotope record shows evidence for periods of freshwater run-off at times other than glacial terminations. Increased carbonate contents are also associated with these events
    Schlagwort(e): 96-619; Calcium carbonate; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Globigerinoides ruber, δ13C; Globigerinoides ruber, δ18O; Glomar Challenger; Gulf of Mexico; Leg96; Mass spectrometer VG Micromass 602; Sample code/label; see reference(s)
    Materialart: Dataset
    Format: text/tab-separated-values, 512 data points
    Standort Signatur Erwartet Verfügbarkeit
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